synced clients and traffic trends
TRANSCRIPT
sync’ed clients and traffic trends
Matsuzaki ‘maz’ Yoshinobu <[email protected]>
2015/05 [email protected] 1
traffic and network design
• we plan upgrading based on traffic trend – to avoid congesGons
2015/05 [email protected] 2
network design #1
• over-‐subscripGon – only some of users uses the network at once – expecGng staGsGcal mulGplexing effect – need to esGmate uGlizaGon to avoid congesGon
User
User １００Mbps
１００Mbps
１００Mbps
Internet
2015/05 [email protected] 3
network design #2
• over-‐provisioning – provide more bandwidth than needed
User
User １００Mbps
１００Mbps
1Gbps
Internet
2015/05 [email protected] 4
backbone network design
• based on over-‐subscripGon – we can expect more staGsGcal mulGplexing effect – cost effecGve
• over-‐provisioning to its uGlizaGon – for redundancy – low latency
Backbone
staGsGcal mulGplexing effect 2015/05 [email protected] 5
traffic trend
• we can upgrade based on that – important!
• know your customer – how they are using network
2015/05 [email protected] 21
traffic concentraGon
• it someGmes happens • ‘staGsGcal mulGplexing effect’ is reduced
2015/05 [email protected] 22
how to deal with concentraGons
• upgrade – more bandwidth – cost +
• wait and see – congesGon – customer experience -‐
• something else – ??
2015/05 [email protected] 23
new year greeGngs
• January 1st 00:00-‐02:00 – phone call – SMS – e-‐mail – SNS
• about 7 Gmes more messages than usual • mobile operators have asked users to avoid such messages during the peak Gme
2015/05 [email protected] 24
so\ware/data distribuGon
• Windows Update • iOS/MacOS Update • game update • karaoke update
• several giga byte data • at the same Gme • many clients
2015/05 [email protected] 25
iOS8
• it seems Apple introduced some kinds of queuing mechanism
iOS8 started to distribute
2015/05 [email protected] 26
mobile device
• people bring it always – they can use it anyGme
• it changed traffic pacern – commuGng and lunch Gme
• commuGng is a challenge for mobile in tokyo – about 3000 persons per train – 47 trains per hour – somehow you need to do handover L
2015/05 [email protected] 27
mobile devices and alarm clock
• clock on mobile devices is well synced – you can use mobile as a clock
• mobile devices ‘sleep’ to reduce bacery usage – and once wakeup, it starts to communicate
• mobile operators see high traffic peek at – 6:30, 7:00, 7:30.... – very short period traffic
2015/05 [email protected] 28
summary
• ‘StaGsGcal mulGplexing effect’ is a key of backbone network design
• There could be concentraGons because of social and technical reasons
• Network operators should give feedback – to users, CDNs and applicaGon developers – to avoid concentraGons where possible
2015/05 [email protected] 29